"This major work represents the culmination of studies, extending over some twenty-five years; beginning with the study of "authoritarianism" and dogmatism, the investigations have led into generic problems of the organization and change of attitudes, beliefs, and values" (Williams and Rokeach, 1974). Williams, R. M. and Rokeach, M. (1974) ‘The Nature of Human Values.’, Political Science Quarterly, 89(2), doi: 10.2307/2149267